Good article, although (als he also specifies in the article) it depends on your use case. For some people a big UI framework like Material UI is the right choice.

But for many who are using it right now it is excessive, and they would be better off with a very simple 'headless' library with a few simple components that guarantee accessibility and speed up dev time, like dropdowns and modals. You don't need to have a whole theming system behind it.